Is the national pop requirement on the Tuetonic Order the same as default Heroic Epic? It seemed like I had to wait a long time before I could build it despite having it unlocked.
Also, Professional Soldier doesn't carry over or stack with the other infantry promotions (Field Works, DFP, etc.), so I was hoarding swords before Gunpowder for nothing -- I realize now that it's intentional and makes more sense. Stormtroopers were still contemporary monsters though (especially with Guerilla), kind of giving me Musketeer vibes with how they can get in so quick and deep while causing havoc. They definitely provide blitzkrieg, though I'd have to see them against a more level opponent, as my army was advanced.
Blood and Iron was straight-forward, though I never got to utilize the gifting mechanic; I gifted a few units, but not until mid-game when it's more inconsequential.